Method and apparatus for producing a three-dimensional article

ABSTRACT

Apparatus for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, said apparatus comprising: a working area onto which layers of powdery material are to be placed; a powder storage unit, where said base surface is supporting a supply of powder in said powder storage unit; a powder distribution member, a pivoted powder pushing device for bringing a portion of powder from said base surface to a position between said distribution member and said working area, said distribution member further being arranged to be moveable towards and across the working area so as to distribute the portion of powder onto the working area, wherein a first portion of said pivoted powder pushing device is movable under said distribution member. An associated method and computer program product are also provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 62/241,950, filed Oct. 15, 2015; the contents of which as are hereby incorporated by reference in their entirety.

BACKGROUND

Technical Field

This invention relates to a method and an apparatus for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiating it with an energy beam. In particular, the invention relates to the layer-wise application of powder.

Related Art

Equipment for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiating it with electromagnetic radiation or an electron beam are known from e.g. U.S. Pat. Nos. 4,863,538, 5,647,931 and SE524467. Such equipment include for instance a supply of powder, means for applying a layer of powder on a working area, and means for directing the beam over the working area. The powder sinters or melts and solidifies as the beam moves over the working area. For product quality reasons it is important that the powder is evenly distributed over the working area and that the layer thickness is well-defined and corresponds to a pre-determined value. Further, it is advantageous that the layer is quickly applied in order to keep the production rate as high as possible.

Traditional powder application means generally includes a feeding member and a distribution member where the former transfers a certain quantity of powder from the supply of powder to the distribution member, which in turn distributes the powder over the working area.

The conditions under which the powder application means work are rough; the temperature is high, powder particles find their way into openings and slits, evaporated powder material condensate and form coatings and the like.

JP 2003245981 discloses a powder application system where a supply of powder is stored onto a feeding member in the form of a height-adjustable plate at the side of a working area. Powder is fed to a distributing rake by a) moving the rake sideways away from the working area and over the supply of powder, b) raising the powder supply plate so that a portion of powder becomes positioned above a lower side of the rake, and c) moving the rake towards and across the powder supply so as to transfer the portion of powder towards the working area. A similar system is disclosed in US 2004/0084814. A drawback of such systems is that it is relatively space consuming.

WO 2006/121374 discloses another powder application system wherein the powder supply is arranged in an open manner such as to form an angle of repose on the side of the powder supply facing the working area. A distribution rake is arranged to be moveable towards and a certain distance into the powder supply such as to bring about a transfer of a portion of powder that flows over the rake from the far side of the distribution rake to the side facing the working area. In a second step, the distribution rake is moved towards and across the working area as to distribute the portion of powder onto the working area. An advantage of this system is that no mechanically operated feeding member is required for feeding powder to the distribution rake.

Problems may arise with the device disclosed in WO 2006/121374 when using certain types of powder that do not flow very well. For instance, powder may stay on top of the rake when the rake is moved into the powder supply and the amount of powder in the portion transferred over the rake may vary.

In WO 2010/095987 it is disclosed yet another powder application system wherein a base surface for supporting supply of powder from a powder storage unit is resilient. A drawback with this design is that the rake has to move into the powder supply which creates unnecessary force on the powder distributor. Another problem is that powder may stick on the back side of the powder distributor which may fall off on a newly distributed powder layer and thereby deteriorate its surface finish.

Thus, there is still a need for improvements in this field.

BRIEF SUMMARY

An object of this invention is to provide equipment for layer-wise production of three-dimensional objects, which equipment exhibits improved powder application properties compared to conventional equipment. This object is achieved by an apparatus and method defined by the technical features contained in independent claims. The dependent claims contain advantageous embodiments, further developments and variants of the invention.

In a first aspect of the present invention it is provided an apparatus (100) for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, such as electromagnetic radiation or an electron beam, the apparatus comprising: a working area onto which layers of powdery material are to be placed; a powder storage unit comprising an opening spaced apart from a base surface, where the base surface is supporting a supply of powder in the powder storage unit; and a powder distribution member; wherein the base surface extends along a side of the working area, wherein the distribution member extends in a direction along the base surface and the side of the working area and is arranged to be moveable in a plane above, and substantially parallel to the working area, a pivoted powder pushing device for bringing a portion of powder from the base surface to a position between the distribution member and the working area, the distribution member further being arranged to be moveable towards and across the working area so as to distribute the portion of powder onto the working area, wherein a first portion of the pivoted powder pushing device is movable under the distribution member.

Compared to the devices in prior art design the inventive design provides for a better control of the size of the powder portion being transferred, in particular when using powder with poor flowability. One reason for this improved control is that the transfer of powder below the distribution member is forced with a pivoted powder pushing device, and thereby decouples the physical contact of the powder portion and the powder distributor until the powder portion is actually going to be formed as a layer. Another reason is that the inventive apparatus is less sensitive to the type of powder to be provided in front of the powder distributor since it is more or less independent of the flowability condition of the powder. This means that the size of the powder portion transferred can be controlled in a more exact manner. Another advantage of the present invention is that no powder sensor may be needed to be used in order to measure the amount of powder to be distributed on the working area. Still another advantage of the present invention is that more or less any design of the rake may be used.

In various example embodiments of the present invention the pivoted powder pushing device is mechanically actuated by the distribution member. An exemplary advantage of at least this embodiment is that it is simple end robust.

In various example embodiments of the present invention the pivoted powder pushing device is electrically actuated and controlled by a control unit. An exemplary advantage of at least this embodiment is that it the design may be very compact.

In various example embodiments of the present invention a pivot axle for the pivoted powder pushing device is provided above the base surface. An exemplary advantage of at least this embodiment is that it provides for a simple solution for allowing the rake to be movable above the first portion of the pivoted powder pushing device.

In various example embodiments of the present invention the pivoted powder pushing device interrupts powder flow from the powder storage unit onto the base surface during a portion of its pivoted stroke. An exemplary advantage of at least this embodiment is that powder flow from the powder storage unit may be regulated by the pivoted powder pushing device.

In various example embodiments of the present invention the apparatus comprises a first and a second powder storage unit comprising a first base surface and a second base surface respectively for supporting supply of powder from the first and second powder storage units, the first and second powder storage units are arranged on opposite ends of the working area, wherein above and spaced apart from a portion of the base surface it is provided a net having a surface essentially in parallel with the working area, which net is used for filtering surplus powder after a final powder distribution. An exemplary advantage of at least this embodiment is that surplus powder after a final powder distribution may be reused in a later powder distribution. This means that there is no or very little spill of powder material during the additive manufacturing process.

In various example embodiments of the present invention the powder supply base surface is having a curved shape. An exemplary advantage of at least this embodiment is that this curved surface may have a similar radius of curvature as the pivoted stroke of the first portion of the pivoted powder pushing device. This means that the first portion during its stroke may be arranged at a predetermined distance from the curved surface, which in turn may improve the exactness of the amount of powder to be delivered onto the powder table, i.e., to a position between the distribution member and the working area.

In various example embodiments the working area is located on a vertically adjustable platform. An exemplary advantage of at least this embodiment is that the present invention may be suitable for any type of powder based layer by layer additive manufacturing device. The energy beam source may be one or a plurality of electron beam sources and/or one or a plurality of laser beam sources.

In another aspect of the present invention it is provided a method for producing a three-dimensional article layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, such as electromagnetic radiation or an electron beam, the method comprising: providing a powder storage unit comprising an opening spaced apart from a base surface, where the base surface is supporting a supply of powder in the powder storage unit; bringing a predetermined amount of powder from the base surface to a position between the distribution member and the working area with a pivoted powder pushing device, moving the distribution member towards and across the working area so as to distribute the portion of powder onto the working area for forming a layer of powder material, wherein a portion of the pivoted powder pushing device is movable under the distribution member.

In yet another aspect of the present invention, a computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions embodied therein. The computer-readable program code portions comprises at least one executable portion configured for: providing a powder storage unit comprising an opening spaced apart from a base surface, where the base surface is supporting a supply of powder in the powder storage unit; bringing a predetermined amount of powder from the base surface to a position between the distribution member and the working area with a pivoted powder pushing device; and moving the distribution member towards and across the working area so as to distribute the portion of powder onto the working area for forming a layer of powder material, wherein a portion of the pivoted powder pushing device is movable under the distribution member.

In yet another aspect of the present invention, a pivoted powder pushing device (125) is provided for bringing a portion of powder from a base surface (130) of an apparatus (100) for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiation thereof with an energy beam and to a position between a distribution member (185) and a working area (190) of the apparatus. The pivoted powder pushing device (125) comprises: a first portion (170), and a contact member (154), wherein: the contact member (154) is configured to operatively engage a grip arm (150) of the distribution member (185) when the distribution member (185) is positioned at least in part above the base surface (130), and the first portion (170) is moved via the engagement of the grip arm (150) and the contact member (154) in a first direction opposite a direction of travel of the distribution member (185), such that the first portion (170) of the pivoted powder pushing device (125) passes under the distribution member (185).

In yet another aspect of the present invention, and apparatus (100) is provided for producing a three-dimensional object layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, such as electromagnetic radiation or an electron beam. The apparatus (100) comprises: a pivoted powder pushing device (125) for bringing a portion of powder from a base surface (130) of the apparatus to a position between a distribution member (185) of the apparatus and a working area (190) of the apparatus, wherein: the pivoted powder pushing device (125) comprises a first portion (170), and a contact member (154), the contact member (154) is configured to operatively engage a grip arm (150) of the distribution member (185) when the distribution member (185) is positioned at least in part above the base surface (130), and the first portion (170) is moved via the engagement of the grip arm (150) and the contact member (154) in a first direction opposite a direction of travel of the distribution member (185), such that the first portion (170) of the pivoted powder pushing device (125) passes under the distribution member (185).

In yet another aspect of the present invention, a computer-implemented method is provided for producing a three-dimensional article layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, such as electromagnetic radiation or an electron beam. The method comprises the steps of: providing a powder storage unit comprising an opening spaced apart from a base surface, where the base surface is supporting a supply of powder in the powder storage unit; bringing a predetermined amount of powder from the base surface to a position between the distribution member and the working area with a pivoted powder pushing device; and moving the distribution member towards and across the working area so as to distribute the portion of powder onto the working area for forming a layer of powder material, wherein: the pivoted powder pushing device (125) comprises a first portion (170), and a contact member (154), the contact member (154) is configured to operatively engage a grip arm (150) of the distribution member (185) when the distribution member (185) is positioned at least in part above the base surface (130), and the first portion (170) is moved via the engagement of the grip arm (150) and the contact member (154) in a first direction opposite a direction of travel of the distribution member (185), such that the first portion (170) of the pivoted powder pushing device (125) passes under the distribution member (185).

In yet another aspect of the present invention, a computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions embodied therein is provided. The computer-readable program code portions comprising at least one executable portion is configured for: providing a powder storage unit comprising an opening spaced apart from a base surface, where the base surface is supporting a supply of powder in the powder storage unit; bringing a predetermined amount of powder from the base surface to a position between the distribution member and the working area with a pivoted powder pushing device; and moving the distribution member towards and across the working area so as to distribute the portion of powder onto the working area for forming a layer of powder material, wherein: the pivoted powder pushing device (125) comprises a first portion (170), and a contact member (154), the contact member (154) is configured to operatively engage a grip arm (150) of the distribution member (185) when the distribution member (185) is positioned at least in part above the base surface (130), and the first portion (170) is moved via the engagement of the grip arm (150) and the contact member (154) in a first direction opposite a direction of travel of the distribution member (185), such that the first portion (170) of the pivoted powder pushing device (125) passes under the distribution member (185).

An exemplary advantage of at least this embodiment and various other example embodiments of the inventive method is the same as the corresponding apparatus embodiments.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

The invention will be further described in the following, in a non-limiting way with reference to the accompanying drawings. Same characters of reference are employed to indicate corresponding similar parts throughout the several figures of the drawings:

FIG. 1A depicts in a schematic front left perspective view, an example embodiment of the invention where a pivoted powder pushing element is in a first end position.

FIG. 1B depicts in a schematic front left cross-sectional view, an example embodiment of the invention where a pivoted powder pushing element is in a first end position.

FIG. 2A depicts in a schematic front left perspective view, an example embodiment of the invention where a pivoted powder pushing element is in a second end position.

FIG. 2B depicts in a schematic front left cross-sectional view, an example embodiment of the invention where a pivoted powder pushing element is in a second end position.

FIG. 3 depicts a schematic flow chart of an example embodiment of the method according to the present invention.

FIG. 4 is a block diagram of an exemplary system according to various embodiments of the present invention.

FIG. 5A is a schematic block diagram of a server according to various embodiments of the present invention.

FIG. 5B is a schematic block diagram of an exemplary mobile device according to various embodiments of the present invention.

DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS

To facilitate the understanding of this invention, a number of terms are defined below. Terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention.

Terms such as “a”, “an” and “the” are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as outlined in the claims.

The term “three-dimensional structures” and the like as used herein refer generally to intended or actually fabricated three-dimensional configurations (e.g. of structural material or materials) that are intended to be used for a particular purpose. Such structures, etc. may, for example, be designed with the aid of a three-dimensional CAD system.

The term “electron beam” as used herein in various embodiments refers to any charged particle beam. The source of a charged particle beam can include an electron gun, a linear accelerator and so on.

FIGS. 1A-B and 2A-B show the components and the function of a first example embodiment of the invention. As shown in these figures the inventive apparatus 100 comprises a powder application system arranged on a substantially flat working table 195, which system comprises a powder storage unit 110 arranged on one side of a working area 190 located on top of a vertically adjustable platform that fits into a cut-out in the working table 195.

The powder storage unit 110 is adapted to contain a supply of powder. A distribution member 185, here in the form of a rake, extends along the working area 190 and may be arranged by means of guides (not shown) to be moveable across the working area 190 in a direction perpendicular to its direction of extension and in a plane slightly above the working area 190.

A radiation source (not shown) is arranged in a conventional way at a distance above the working area 190, which working area 190 acts as a target area for the electromagnetic radiation or electron beam used to solidify the powder. If an electron beam is used the additive manufacturing process is thoroughly enclosed, sealed and evacuated to avoid that gas molecules interfere with the electron beam.

The powder storage unit 110, together with its corresponding powder supply, extends along a side of the working area 190 in a direction substantially parallel to the rake or powder distributor 185. The powder storage unit 110 together with a supporting base surface 130 define limiting parts of the powder storage unit 110 and keep the supply of powder in place. The supporting base surface 130 may have a curved surface with a predetermined radius of curvature. The powder storage unit 110 is arranged in an open manner by letting an opening 160 of the powder storage unit 160 at a distance above the base surface 130. This has the effect that a lower part of the supply of powder is free to at least partially fill up a volume defined by the curved base surface 130 up to a level in parallel with the working table 195. The powder storage unit 110 may be filled or refilled from above.

The function of the powder application system of the apparatus 100 will now be described. FIGS. 1A-B and 2A-B refer to an initial state with regard to the production of a three-dimensional object, i.e. the working area 190 is adjusted to a position slightly below the level of the working table 195 as to facilitate an application of the first layer of powder onto the working area 190.

FIG. 1A depicts in a schematic front left perspective view and FIG. 1 b depicts in a schematic front left cross-sectional view of an example embodiment of the invention where a pivoted powder pushing element is in a first end position. In FIG. 1 a the rake 185 is in a first position where it is in motion to the right towards the powder storage unit 110.

The pivoted powder pushing device 125 comprises in an example embodiment a first portion 170, an arm 120 and a contact member 154. The pivoted powder pushing device 125 is arranged on a pivot axle 140. The pivot axle 140 may be arranged in the front upper end toward the working area 190. In this first end position the first portion 170 of the pivoted powder pushing device 125 is arranged behind the opening 160 of the powder storage unit 110. Moreover, in the first end position of the first portion 170 the contact member 154 is not affected by a grip arm 150 arranged on the rake 185. The grip arm may be provided with a slot 152 arranged for fitting into the contact member 154. The contact member 154 may in an example embodiment be in the form of a rod attached to the pushing device with a base surface of the rod.

In FIGS. 2A-B the rake 185 has reached a second position somewhere above the curved base surface 130. The rake 185 is with its grip arm 150 mechanically contacting the contact member 154 of the powder pushing device 125 and has moved the first portion 170 in a forward direction towards the working area 190 to a second end position. As the rake 185 moves in a direction towards the powder storage unit 110 a first portion 170 moves in an opposite direction from the position behind the opening 160 of the powder storage unit 110 towards the working area 190. The first portion 170 is moving in a curved trajectory which may essentially resemble with the curved base surface 130. The curved trajectory of the first portion 170 may have a slightly smaller radius of curvature than the curved base surface 130. The curvature of the base surface 130 is bent downwardly with respect to the powder storage unit 110.

The first portion 170 may be moving at a predetermined distance from the curved base surface 130. As the first portion 170 is moving towards the working area 190 a predetermined amount of powder is pushed in front of the first portion 170 to be delivered on the working table 195.

The pivoted powder pushing device 125 may be electrically actuated and controlled by a control unit instead of as disclosed above be mechanically actuated by the rake 185. The electrical actuation may be triggered by a first position of the rake so that the pivoted motion of the first portion 170 starts when the rake is passing a predetermined position. The return stroke of the first portion may be triggered by a second position of the rake or after a certain time period when the rake was passing the first position.

When the rake 185 is forcing the first portion 170 in a forward direction towards the working area 190 the rake 185 is moving towards the powder storage unit 110. The first portion 170 will pass below the rake 185.

The pivoted powder pushing device 125 may interrupt powder flow from the powder storage unit 110 onto the curved base surface 130 during a portion of its pivoted stroke. In FIG. 1 b the first portion 170 is positioned behind the opening 160 of the powder storage unit 110. As the first portion 170 starts to move in a direction towards the working area 190, the first portion 170 will pass below the opening 160 of the powder storage unit 110. The powder flow from the powder storage unit 110 may be arranged to be interrupted when the first portion is arranged below the opening 160. By a suitable design of the size of the first portion 170 and a length of the stroke of the portion 170 the interruption of powder flow may be a minor or major part of the total stroke.

A net 180 may be provided above the curved base surface 130. The net 180 will prohibit any powder agglomerates and/or metal flakes to mix with the powder material as the rake 185 is moved above the curved base surface 130. Surplus powder material is allowed to fall down through the net 180 but powder agglomerates and/or metal flakes will stay on the net 180. The powder distribution mechanism according to the embodiment depicted in FIGS. 1A-B and 2A-B has little or no powder spill. Surplus powder from a powder distribution cycle in which a powder layer is applied onto the working table will fall down through the net 180 and used in a later powder distribution cycle.

By the inventive method the rake 185 does not have to contact the powder material before starting to deliver the material on top of the work table 190. The amount of powder that will be transferred onto the working area 190 is generally dependent on the shape of the first portion 170 and the length of a stroke of the first portion. The larger a front area 178 of the first portion the more material will be transferred to the working area 190. The longer the stroke the more material will be transferred to the working area 190. A front area angle with respect to a line orthogonal to the concave base surface 130 will also affect the amount of powder transferred to the working are. A mean value of the front area angle for a full stroke of the first portion 170 as close to 90° will most efficiently transfer powder from the concave base surface 130 to the working table 195.

The first portion 170 may be shaped like a wedge so that the front area 178 is pushing powder in front of the first portion when moving the first portion in the direction towards the working area 190. During a return stroke, i.e., when the first portion 170 is moving towards the powder storage unit 110, the wedge formed shape of the first portion 170 will ensure as little as possible powder transport in a direction in parallel with the pivoted return stroke. This means that powder is pushed in front of the first portion 170 only when the first portion is moving towards the working area 190 and not when the first portion 170 is moving in the opposite direction, i.e., towards the powder storage unit 110.

In FIG. 3 it is depicted a schematic flow chart of a method for producing a three-dimensional article layer by layer using a powdery material which can be solidified by irradiating it with an energy beam, such as electromagnetic radiation or an electron beam according to various example embodiments of the present invention.

In a first step 310 a powder storage unit comprising an opening spaced apart from a base surface is provided, where the base surface is supporting a supply of powder in the powder storage unit. The opening towards the base surface may be in the form of a single elongated slit extending along a side of the working area 190.

In a second step 320 a predetermined amount of powder is transported from the base surface to a position between the distribution member and the working area with a pivoted powder pushing device, wherein a portion of the pivoted powder pushing device is movable under the distribution member. During the movement of the powder from the base surface onto the working table 195 a first portion 170 of the powder pushing device is moving beneath the rake/powder distribution member 185. The rake 185 is moving in a plan in parallel with and at a predetermined distance from the working table 195. However, the first portion is having a curved trajectory. This means that the rake 185 may pass above the first portion 170, when the first portion 170 is at a predetermined distance from its end positions of its curved stroke.

In a third step 330 the distribution member is moving towards and across the working area 190 so as to distribute the portion of powder onto the working area 190 for forming a layer of powder material. The powder material provided on the working table 195 by the first portion 170 may be sufficient for providing a complete powder layer with a predetermined thickness onto the working area.

The first portion 170 may be mechanically actuated by the rake 185. In another example embodiment the first portion is electrically actuated. The actuation may be triggered by the position and/or the timing of the rake 185. Accordingly, the volume of powder may be controlled in a more exact manner with the present invention.

In another aspect of the invention it is provided a program element configured and arranged when executed on a computer to implement a method for forming at least one three-dimensional article through successive fusion of parts of a powder bed, which parts correspond to successive portions of the three-dimensional article. The program element may specifically be configured to perform the steps as outlined in the claim set provided herein.

The program element may be installed in one or more non-transitory computer readable storage mediums. The non-transitory computer readable storage mediums and/or the program element may be the control unit 150 or another control unit. The computer readable storage mediums and the program elements, which may comprise non-transitory computer-readable program code portions embodied therein, may further be contained within one or more non-transitory computer program products. According to various embodiments, the method described elsewhere herein may be computer-implemented, for example in conjunction with one or more processors and/or memory storage areas. Further details regarding these features and configurations are provided, in turn, below.

As mentioned, various embodiments of the present invention may be implemented in various ways, including as non-transitory computer program products. A computer program product may include a non-transitory computer-readable storage medium storing applications, programs, program modules, scripts, source code, program code, object code, byte code, compiled code, interpreted code, machine code, executable instructions, and/or the like (also referred to herein as executable instructions, instructions for execution, program code, and/or similar terms used herein interchangeably). Such non-transitory computer-readable storage media include all computer-readable media (including volatile and non-volatile media).

In one embodiment, a non-volatile computer-readable storage medium may include a floppy disk, flexible disk, hard disk, solid-state storage (SSS) (e.g., a solid state drive (SSD), solid state card (SSC), solid state module (SSM)), enterprise flash drive, magnetic tape, or any other non-transitory magnetic medium, and/or the like. A non-volatile computer-readable storage medium may also include a punch card, paper tape, optical mark sheet (or any other physical medium with patterns of holes or other optically recognizable indicia), compact disc read only memory (CD-ROM), compact disc compact disc-rewritable (CD-RW), digital versatile disc (DVD), Blu-ray disc (BD), any other non-transitory optical medium, and/or the like. Such a non-volatile computer-readable storage medium may also include read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory (e.g., Serial, NAND, NOR, and/or the like), multimedia memory cards (MMC), secure digital (SD) memory cards, SmartMedia cards, CompactFlash (CF) cards, Memory Sticks, and/or the like. Further, a non-volatile computer-readable storage medium may also include conductive-bridging random access memory (CBRAM), phase-change random access memory (PRAM), ferroelectric random-access memory (FeRAM), non-volatile random-access memory (NVRAM), magnetoresistive random-access memory (MRAM), resistive random-access memory (RRAM), Silicon-Oxide-Nitride-Oxide-Silicon memory (SONOS), floating junction gate random access memory (FJG RAM), Millipede memory, racetrack memory, and/or the like.

In one embodiment, a volatile computer-readable storage medium may include random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), fast page mode dynamic random access memory (FPM DRAM), extended data-out dynamic random access memory (EDO DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), double data rate type two synchronous dynamic random access memory (DDR2 SDRAM), double data rate type three synchronous dynamic random access memory (DDR3 SDRAM), Rambus dynamic random access memory (RDRAM), Twin Transistor RAM (TTRAM), Thyristor RAM (T-RAM), Zero-capacitor (Z-RAM), Rambus in-line memory module (RIMM), dual in-line memory module (DIMM), single in-line memory module (SIMM), video random access memory VRAM, cache memory (including various levels), flash memory, register memory, and/or the like. It will be appreciated that where embodiments are described to use a computer-readable storage medium, other types of computer-readable storage media may be substituted for or used in addition to the computer-readable storage media described above.

As should be appreciated, various embodiments of the present invention may also be implemented as methods, apparatus, systems, computing devices, computing entities, and/or the like, as have been described elsewhere herein. As such, embodiments of the present invention may take the form of an apparatus, system, computing device, computing entity, and/or the like executing instructions stored on a computer-readable storage medium to perform certain steps or operations. However, embodiments of the present invention may also take the form of an entirely hardware embodiment performing certain steps or operations.

Various embodiments are described below with reference to block diagrams and flowchart illustrations of apparatuses, methods, systems, and computer program products. It should be understood that each block of any of the block diagrams and flowchart illustrations, respectively, may be implemented in part by computer program instructions, e.g., as logical steps or operations executing on a processor in a computing system. These computer program instructions may be loaded onto a computer, such as a special purpose computer or other programmable data processing apparatus to produce a specifically-configured machine, such that the instructions which execute on the computer or other programmable data processing apparatus implement the functions specified in the flowchart block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including computer-readable instructions for implementing the functionality specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions that execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block or blocks.

Accordingly, blocks of the block diagrams and flowchart illustrations support various combinations for performing the specified functions, combinations of operations for performing the specified functions and program instructions for performing the specified functions. It should also be understood that each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, could be implemented by special purpose hardware-based computer systems that perform the specified functions or operations, or combinations of special purpose hardware and computer instructions.

FIG. 4 is a block diagram of an exemplary system 1020 that can be used in conjunction with various embodiments of the present invention. In at least the illustrated embodiment, the system 1020 may include one or more central computing devices 1110, one or more distributed computing devices 1120, and one or more distributed handheld or mobile devices 1300, all configured in communication with a central server 1200 (or control unit) via one or more networks 1130. While FIG. 4 illustrates the various system entities as separate, standalone entities, the various embodiments are not limited to this particular architecture.

According to various embodiments of the present invention, the one or more networks 1130 may be capable of supporting communication in accordance with any one or more of a number of second-generation (2G), 2.5G, third-generation (3G), and/or fourth-generation (4G) mobile communication protocols, or the like. More particularly, the one or more networks 1130 may be capable of supporting communication in accordance with 2G wireless communication protocols IS-136 (TDMA), GSM, and IS-95 (CDMA). Also, for example, the one or more networks 1130 may be capable of supporting communication in accordance with 2.5G wireless communication protocols GPRS, Enhanced Data GSM Environment (EDGE), or the like. In addition, for example, the one or more networks 1130 may be capable of supporting communication in accordance with 3G wireless communication protocols such as Universal Mobile Telephone System (UMTS) network employing Wideband Code Division Multiple Access (WCDMA) radio access technology. Some narrow-band AMPS (NAMPS), as well as TACS, network(s) may also benefit from embodiments of the present invention, as should dual or higher mode mobile stations (e.g., digital/analog or TDMA/CDMA/analog phones). As yet another example, each of the components of the system 1020 may be configured to communicate with one another in accordance with techniques such as, for example, radio frequency (RF), Bluetooth™, infrared (IrDA), or any of a number of different wired or wireless networking techniques, including a wired or wireless Personal Area Network (“PAN”), Local Area Network (“LAN”), Metropolitan Area Network (“MAN”), Wide Area Network (“WAN”), or the like.

Although the device(s) 1110-1300 are illustrated in FIG. 4 as communicating with one another over the same network 1130, these devices may likewise communicate over multiple, separate networks.

According to one embodiment, in addition to receiving data from the server 1200, the distributed devices 1110, 1120, and/or 1300 may be further configured to collect and transmit data on their own. In various embodiments, the devices 1110, 1120, and/or 1300 may be capable of receiving data via one or more input units or devices, such as a keypad, touchpad, barcode scanner, radio frequency identification (RFID) reader, interface card (e.g., modem, etc.) or receiver. The devices 1110, 1120, and/or 1300 may further be capable of storing data to one or more volatile or non-volatile memory modules, and outputting the data via one or more output units or devices, for example, by displaying data to the user operating the device, or by transmitting data, for example over the one or more networks 1130.

In various embodiments, the server 1200 includes various systems for performing one or more functions in accordance with various embodiments of the present invention, including those more particularly shown and described herein. It should be understood, however, that the server 1200 might include a variety of alternative devices for performing one or more like functions, without departing from the spirit and scope of the present invention. For example, at least a portion of the server 1200, in certain embodiments, may be located on the distributed device(s) 1110, 1120, and/or the handheld or mobile device(s) 1300, as may be desirable for particular applications. As will be described in further detail below, in at least one embodiment, the handheld or mobile device(s) 1300 may contain one or more mobile applications 1330 which may be configured so as to provide a user interface for communication with the server 1200, all as will be likewise described in further detail below.

FIG. 5A is a schematic diagram of the server 1200 according to various embodiments. The server 1200 includes a processor 1230 that communicates with other elements within the server via a system interface or bus 1235. Also included in the server 1200 is a display/input device 1250 for receiving and displaying data. This display/input device 1250 may be, for example, a keyboard or pointing device that is used in combination with a monitor. The server 1200 further includes memory 1220, which typically includes both read only memory (ROM) 1226 and random access memory (RAM) 1222. The server's ROM 1226 is used to store a basic input/output system 1224 (BIOS), containing the basic routines that help to transfer information between elements within the server 1200. Various ROM and RAM configurations have been previously described herein.

In addition, the server 1200 includes at least one storage device or program storage 210, such as a hard disk drive, a floppy disk drive, a CD Rom drive, or optical disk drive, for storing information on various computer-readable media, such as a hard disk, a removable magnetic disk, or a CD-ROM disk. As will be appreciated by one of ordinary skill in the art, each of these storage devices 1210 are connected to the system bus 1235 by an appropriate interface. The storage devices 1210 and their associated computer-readable media provide nonvolatile storage for a personal computer. As will be appreciated by one of ordinary skill in the art, the computer-readable media described above could be replaced by any other type of computer-readable media known in the art. Such media include, for example, magnetic cassettes, flash memory cards, digital video disks, and Bernoulli cartridges.

Although not shown, according to an embodiment, the storage device 1210 and/or memory of the server 1200 may further provide the functions of a data storage device, which may store historical and/or current delivery data and delivery conditions that may be accessed by the server 1200. In this regard, the storage device 1210 may comprise one or more databases. The term “database” refers to a structured collection of records or data that is stored in a computer system, such as via a relational database, hierarchical database, or network database and as such, should not be construed in a limiting fashion.

A number of program modules (e.g., exemplary modules 1400-1700) comprising, for example, one or more computer-readable program code portions executable by the processor 1230, may be stored by the various storage devices 1210 and within RAM 1222. Such program modules may also include an operating system 1280. In these and other embodiments, the various modules 1400, 1500, 1600, 1700 control certain aspects of the operation of the server 1200 with the assistance of the processor 1230 and operating system 1280. In still other embodiments, it should be understood that one or more additional and/or alternative modules may also be provided, without departing from the scope and nature of the present invention.

In various embodiments, the program modules 1400, 1500, 1600, 1700 are executed by the server 1200 and are configured to generate one or more graphical user interfaces, reports, instructions, and/or notifications/alerts, all accessible and/or transmittable to various users of the system 1020. In certain embodiments, the user interfaces, reports, instructions, and/or notifications/alerts may be accessible via one or more networks 1130, which may include the Internet or other feasible communications network, as previously discussed.

In various embodiments, it should also be understood that one or more of the modules 1400, 1500, 1600, 1700 may be alternatively and/or additionally (e.g., in duplicate) stored locally on one or more of the devices 1110, 1120, and/or 1300 and may be executed by one or more processors of the same. According to various embodiments, the modules 1400, 1500, 1600, 1700 may send data to, receive data from, and utilize data contained in one or more databases, which may be comprised of one or more separate, linked and/or networked databases.

Also located within the server 1200 is a network interface 1260 for interfacing and communicating with other elements of the one or more networks 1130. It will be appreciated by one of ordinary skill in the art that one or more of the server 1200 components may be located geographically remotely from other server components. Furthermore, one or more of the server 1200 components may be combined, and/or additional components performing functions described herein may also be included in the server.

While the foregoing describes a single processor 1230, as one of ordinary skill in the art will recognize, the server 1200 may comprise multiple processors operating in conjunction with one another to perform the functionality described herein. In addition to the memory 1220, the processor 1230 can also be connected to at least one interface or other means for displaying, transmitting and/or receiving data, content or the like. In this regard, the interface(s) can include at least one communication interface or other means for transmitting and/or receiving data, content or the like, as well as at least one user interface that can include a display and/or a user input interface, as will be described in further detail below. The user input interface, in turn, can comprise any of a number of devices allowing the entity to receive data from a user, such as a keypad, a touch display, a joystick or other input device.

Still further, while reference is made to the “server” 1200, as one of ordinary skill in the art will recognize, embodiments of the present invention are not limited to traditionally defined server architectures. Still further, the system of embodiments of the present invention is not limited to a single server, or similar network entity or mainframe computer system. Other similar architectures including one or more network entities operating in conjunction with one another to provide the functionality described herein may likewise be used without departing from the spirit and scope of embodiments of the present invention. For example, a mesh network of two or more personal computers (PCs), similar electronic devices, or handheld portable devices, collaborating with one another to provide the functionality described herein in association with the server 1200 may likewise be used without departing from the spirit and scope of embodiments of the present invention.

According to various embodiments, many individual steps of a process may or may not be carried out utilizing the computer systems and/or servers described herein, and the degree of computer implementation may vary, as may be desirable and/or beneficial for one or more particular applications.

FIG. 5B provides an illustrative schematic representative of a mobile device 1300 that can be used in conjunction with various embodiments of the present invention. Mobile devices 1300 can be operated by various parties. As shown in FIG. 5B, a mobile device 1300 may include an antenna 1312, a transmitter 1304 (e.g., radio), a receiver 1306 (e.g., radio), and a processing element 1308 that provides signals to and receives signals from the transmitter 1304 and receiver 1306, respectively.

The signals provided to and received from the transmitter 1304 and the receiver 1306, respectively, may include signaling data in accordance with an air interface standard of applicable wireless systems to communicate with various entities, such as the server 1200, the distributed devices 1110, 1120, and/or the like. In this regard, the mobile device 1300 may be capable of operating with one or more air interface standards, communication protocols, modulation types, and access types. More particularly, the mobile device 1300 may operate in accordance with any of a number of wireless communication standards and protocols. In a particular embodiment, the mobile device 1300 may operate in accordance with multiple wireless communication standards and protocols, such as GPRS, UMTS, CDMA2000, 1×RTT, WCDMA, TD-SCDMA, LTE, E-UTRAN, EVDO, HSPA, HSDPA, Wi-Fi, WiMAX, UWB, IR protocols, Bluetooth protocols, USB protocols, and/or any other wireless protocol.

Via these communication standards and protocols, the mobile device 1300 may according to various embodiments communicate with various other entities using concepts such as Unstructured Supplementary Service data (USSD), Short Message Service (SMS), Multimedia Messaging Service (MMS), Dual-Tone Multi-Frequency Signaling (DTMF), and/or Subscriber Identity Module Dialer (SIM dialer). The mobile device 1300 can also download changes, add-ons, and updates, for instance, to its firmware, software (e.g., including executable instructions, applications, program modules), and operating system.

According to one embodiment, the mobile device 1300 may include a location determining device and/or functionality. For example, the mobile device 1300 may include a GPS module adapted to acquire, for example, latitude, longitude, altitude, geocode, course, and/or speed data. In one embodiment, the GPS module acquires data, sometimes known as ephemeris data, by identifying the number of satellites in view and the relative positions of those satellites.

The mobile device 1300 may also comprise a user interface (that can include a display 1316 coupled to a processing element 1308) and/or a user input interface (coupled to a processing element 308). The user input interface can comprise any of a number of devices allowing the mobile device 1300 to receive data, such as a keypad 1318 (hard or soft), a touch display, voice or motion interfaces, or other input device. In embodiments including a keypad 1318, the keypad can include (or cause display of) the conventional numeric (0-9) and related keys (#, *), and other keys used for operating the mobile device 1300 and may include a full set of alphabetic keys or set of keys that may be activated to provide a full set of alphanumeric keys. In addition to providing input, the user input interface can be used, for example, to activate or deactivate certain functions, such as screen savers and/or sleep modes.

The mobile device 1300 can also include volatile storage or memory 1322 and/or non-volatile storage or memory 1324, which can be embedded and/or may be removable. For example, the non-volatile memory may be ROM, PROM, EPROM, EEPROM, flash memory, MMCs, SD memory cards, Memory Sticks, CBRAM, PRAM, FeRAM, RRAM, SONOS, racetrack memory, and/or the like. The volatile memory may be RAM, DRAM, SRAM, FPM DRAM, EDO DRAM, SDRAM, DDR SDRAM, DDR2 SDRAM, DDR3 SDRAM, RDRAM, RIMM, DIMM, SIMM, VRAM, cache memory, register memory, and/or the like. The volatile and non-volatile storage or memory can store databases, database instances, database mapping systems, data, applications, programs, program modules, scripts, source code, object code, byte code, compiled code, interpreted code, machine code, executable instructions, and/or the like to implement the functions of the mobile device 1300.

The mobile device 1300 may also include one or more of a camera 1326 and a mobile application 1330. The camera 1326 may be configured according to various embodiments as an additional and/or alternative data collection feature, whereby one or more items may be read, stored, and/or transmitted by the mobile device 1300 via the camera. The mobile application 1330 may further provide a feature via which various tasks may be performed with the mobile device 1300. Various configurations may be provided, as may be desirable for one or more users of the mobile device 1300 and the system 1020 as a whole.

It will be appreciated that many variations of the above systems and methods are possible, and that deviation from the above embodiments are possible, but yet within the scope of the claims. Many modifications and other embodiments of the invention set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. For instance the apparatus may comprise a first and a second powder storage unit comprising a first base surface and a second base surface respectively for supporting supply of powder from the first and second powder storage units, the first and second powder storage units are arranged on opposite ends of the working area. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. 

The invention claimed is:
 1. An apparatus (100) for producing a three-dimensional object layer by layer using a powder material which can be solidified by irradiating it with an energy beam, said apparatus (100) comprising: a working area (190) onto which layers of powder material are to be placed; a powder storage unit (110) comprising an opening (160) spaced apart from a base surface (130), where said base surface (130) supports a supply of powder from said powder storage unit (110); a powder distribution member (185) extending in a direction along the base surface (130) and said side of the working area (190) and arranged to be moveable in a plane above, and substantially parallel to the working area (190); a net (180) positioned above said base surface (130) and intermediate the powder distribution member (185) and the base surface (130), wherein the net (180) is configured to permit surplus powder material to pass there-through and onto said base surface (130) and prevent powder agglomerates or metal flakes from passing there-through; and a pivoted powder pushing device (125) for bringing a portion of powder from said base surface (130) to a position between said powder distribution member (185) and said working area (190), said powder distribution member (185) further being arranged to be moveable towards and across the working area (190) so as to distribute the portion of powder onto the working area (190), wherein: a first portion (170) of said pivoted powder pushing device (125) is movable under said powder distribution member (185) with a stroke between a first position and a second position such that an amount of powder transferred to the working area (190) depends on a length of said stroke from the first position to the second position; and as the first portion (170) moves under said powder distribution member (185) and towards the working area (190), the net (180) lifts in conjunction with the first portion (170) to expose at least a portion of the first portion (170) from beneath the net (180).
 2. The apparatus according to claim 1, wherein said pivoted powder pushing device (125) is mechanically actuated by said powder distribution member (185).
 3. The apparatus according to claim 1, wherein said pivoted powder pushing device (125) is electrically actuated and controlled by a control unit.
 4. The apparatus according to claim 1, wherein a pivot axle (140) for said pivoted powder pushing device (125) is provided above said base surface (130).
 5. The apparatus (1) according to claim 1, wherein said pivoted powder pushing device (125) interrupts powder flow from said powder storage unit (110) onto said base surface (130) during a portion of its pivoted stroke.
 6. The apparatus (1) according to claim 1, wherein said apparatus (100) comprises a second powder storage unit comprising a second base surface for supporting supply of powder from said second powder storage unit, said second powder storage unit arranged on an end of said working area (190) opposite to the powder storage unit (110), wherein above and spaced apart from a portion of said base surface and said second base surface is provided the net (180) having a surface essentially in parallel with the working area (190).
 7. The apparatus (1) according to claim 1, wherein said base surface (130) has a curved shape.
 8. The apparatus (1) according to claim 1, wherein the working area (190) is located on a vertically adjustable platform.
 9. The apparatus (1) according to claim 1, further comprising the energy beam, wherein the portion of powder distributed onto the working area (190) is exposed to said energy beam.
 10. The apparatus (1) according to claim 1, wherein: the powder distribution member (185) is moveable in a first direction toward and over the base surface (130), and the first portion (170) of said pivoted powder pushing device (125) is movable in a second direction toward the working area (190), the first and second directions being opposite relative to one another, such that the first portion (170), at one point, moves under said powder distribution member (185).
 11. The apparatus (1) according to claim 10, wherein: the powder distribution member (185) is moveable in the first direction in a translational fashion, and the first portion (170) of said pivoted powder pushing device (125) is movable in the second direction in a curved trajectory.
 12. The apparatus (1) according to claim 10, wherein: the powder distribution member (185) further comprises a grip arm (150), the pivoted powder pushing device (125) further comprises a contact member (154), and contact between the contact member (154) and the grip arm (150) imposes the movement of the first portion (170) of said pivoted powder pushing device (125).
 13. The apparatus (1) according to claim 12, wherein the contact between the contact member (154) and the grip arm (150) occurs only when the powder distribution member (185) is positioned over the base surface (130).
 14. The apparatus (1) according to claim 1, wherein: the powder distribution member (185) further comprises a grip arm (150), the pivoted powder pushing device (125) further comprises a contact member (154), and contact between the contact member (154) and the grip arm (150) imposes the movement of the first portion (170) of said pivoted powder pushing device (125).
 15. The apparatus (1) according to claim 14, wherein the contact between the contact member (154) and the grip arm (150) occurs only when the powder distribution member (185) is positioned over the base surface (130).
 16. A computer-implemented method for producing a three-dimensional article, with the apparatus of claim 1, layer by layer using the powder material which can be solidified by irradiating it with the energy beam, said method comprising: using the apparatus of claim 1 to carry out the steps of: providing the powder storage unit comprising the opening spaced apart from the base surface, where said base surface is supporting the supply of powder in said powder storage unit; bringing a predetermined amount of powder from said base surface to the position between said distribution member and said working area with the pivoted powder pushing device, and moving said distribution member towards and across the working area so as to distribute the portion of powder onto the working area for forming a layer of powder material.
 17. The method according to claim 16, further comprising the step of actuating said pivoted powder pushing device mechanically by said distribution member.
 18. The method according to claim 16, further comprising the step of actuating said pivoted powder pushing device electrically and controlling said actuation by a control unit.
 19. The method according to claim 1, further comprising the step of arranging a pivot axle for said pivoted powder pushing device above said base surface.
 20. The method according to claim 16, further comprising the step of interrupting powder flow from said powder storage unit onto said base surface with said pivoted powder pushing device during a portion of its pivoted stroke.
 21. The method according to claim 16, wherein said powder supply base surface has a curved shape.
 22. The method according to claim 16, further comprising the step of providing said working area on a vertically adjustable platform.
 23. The method according to claim 16, wherein said energy beam is an electromagnetic beam or an electron beam.
 24. The method according to claim 16, wherein the step of bringing the predetermined amount of powder from said base surface to the position between said distribution member and said working area with the pivoted powder pushing device comprises the sub-steps of simultaneously: moving the distribution member (185) is in a first direction toward and over the base surface (130), and moving the first portion (170) of said pivoted powder pushing device (125) in a second direction toward the working area (190), the first and second directions being opposite relative to one another, such that the first portion (170), at one point, moves under said distribution member (185).
 25. The apparatus (1) according to claim 1, wherein the first portion (170) extends above the plane of the working area (190) when positioned between the powder distribution member (185) and the working area (190).
 26. The apparatus (1) according to claim 1, wherein the first portion (170) translates along the base surface (130) to bring the portion of powder from said base surface (130) to the position between said powder distribution member (185) and said working area (190) such that the first portion (170) is in continuous contact with the base surface (130).
 27. The apparatus (1) according to claim 1, wherein the first portion (170) of the pivoted powder pushing device (125) is a wedge comprising: a front area (178); a top surface; and a bottom surface, wherein: the top surface and the bottom surface converge to form a rear edge such that: the front area (178) pushes powder in front of the first portion (170) when the first portion (170) is moving in a direction towards the working area (190); and the front area (178) does not push powder in front of the first portion (170) when the first portion (170) is moving in a direction towards the powder storage unit (110).
 28. The apparatus (1) according to claim 27, wherein: said base surface (130) has a curved shape; and a mean value of an angle of the front area (178) with respect to a line orthogonal to the base surface (130) is 90° for a full stroke of the first portion (170).
 29. The apparatus (1) according to claim 1, wherein as the first portion (170) moves away from the working area (190), the net (180) lowers in conjunction with the first portion (170) to a level position. 